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High Altitude Carburetor Adjustment
Technical Information 157
High Altitude Carburetor Adjustment
At high altitude, the standard carburetor air-fuel
mixture will be too rich. Performance will
decrease, and fuel consumption will increase. A
very rich mixture will also foul the spark plug and
cause hard starting. Operation at an altitude that
differs from that at which this engine was certified,
for extended periods of time, may increase
emissions.
High altitude performance can be improved by
specific modifications to the carburetor. If you
always operate your engine at altitudes above
6,500 feet (2,000 meters), have your servicing
dealer perform this carburetor modification. This
engine, when operated at high altitude with the
carburetor modifications for high altitude use, will
meet each emission standard throughout its useful
life.
Even with carburetor modification, engine
horsepower will decrease about 3.5% for each
1,000-foot (300-meter) increase in altitude. The
effect of altitude on horsepower will be greater
than this if no carburetor modification is made.
NOTICE
When the carburetor has been modified for high
altitude operation, the air-fuel mixture will be too
lean for low altitude use. Operation at altitudes
below 5,000 feet (1,500 meters) with a modified
carburetor may cause the engine to overheat and
result in serious engine damage. For use at low
altitudes, have your servicing dealer return the
carburetor to original factory specifications.
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